Leonardo DiCaprio and Emma Walmsley are two successful public figures whose careers have developed in completely different industries. DiCaprio is an award-winning Hollywood actor, film producer, and environmental activist. Walmsley is a British business executive best known for leading GSK, a global biopharmaceutical company, from 2017 until the end of 2025. But what is the…
Bohr model: electrons orbit at fixed energy levels En = −13.6/n² eV. Transitions produce spectral lines. Emission and absorption spectra, hydrogen spectrum series, worked examples.
Why is the speed of light the same for every observer? Full formula, unit conversions, the physics behind E=mc², and how it was first measured.
Half-life t½ = ln2/λ: time for half of a radioactive sample to decay. Decay formula N = N₀e^(−λt), worked examples, carbon dating, and activity calculations.
Einstein’s E = mc²: mass and energy are equivalent. Mass defect in nuclear reactions, binding energy, fission and fusion energy release, and 4 worked examples.
What if matter could behave like a wave? That surprising idea became one of the foundations of quantum mechanics when French physicist Louis de Broglie proposed that particles have wave-like properties. The De Broglie Wavelength connects the wavelength of a particle with its momentum through the famous equation λ = h/mv. The idea applies to…
How can something behave like a wave in one experiment and like a particle in another? This surprising question is at the heart of modern quantum physics. Light can produce interference patterns like a wave, yet it can also arrive at a detector as individual packets of energy called photons. The same strange behavior applies…
How can shining light on a metal surface cause electrons to escape from the metal? This question became one of the most important clues that classical physics could not fully explain the behavior of light. The Photoelectric Effect occurs when light with sufficient frequency strikes a material and causes electrons to be emitted from its…
Imagine traveling through space at a speed incredibly close to the speed of light. Your watch still seems to tick normally to you, your spacecraft still feels ordinary, and you can measure its length just as you always have. But an observer watching you from Earth can measure a different passage of time and a…
The three types of radioactive decay, how half-life actually works, and real applications from carbon dating to nuclear medicine, fully explained.
